Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a6476ec3930ac7…

MALICIOUS

PDF

87.1 KB Created: 2021-07-06 04:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bc9ac3395fc9f16e069b04c276aa7bfe SHA-1: 4c15b8f6321e79a339dc7df51fb66b36711744a1 SHA-256: 40a6476ec3930ac71878795ed043f042887042506fe5089c89dfd5996b67b3d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a large number of embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://samoinstitute.mn/uploads/assets/file/35235436571.pdf In PDF document text
    • http://guyfamilyreunion.com/clients/41950/File/63723605078.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a1980ec75---seresirepogabipuxej.pdfIn PDF document text
    • http://healthywithhart.com/res/file/pixojej.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/7453104522.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/pozegovitemugidelawarewat.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080fb9e02c48---9457317002.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0603/c6d4fb204225347c37fffc508d0395b6.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/17272504203.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/fntfk21u9kvkj2pesrvrvrk833/85948815855.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16082499d670da---86088279876.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/57aaf78645183f00593f5586c01acfa5/wagaxuteziba.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/57017586495.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a884ca0ab85---duriwivamivoxelobulupu.pdfIn PDF document text
    • http://babamoleskine.com/files/file/davemawoxurinozi.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/67449870491.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/vugukosalonitinewus.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/d7e0bd1f67e39e253ea3280e67378867/rorudutis.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160981fe118f48---26255820921.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/6cc3cc89d22e27d3d0e9aee6ec8bf5c0/35664357331.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/uak1605kobbh5rkgb4sdggv7mm/gojopizetobofi.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/muzak.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160777812c73ca---83975106090.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/39576404961.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/73641350431.pdfIn PDF document text
    • https://tavio.ru/files/file/xogabolikat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pensky+martens+apparatus+is+used+to+find+outPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE88 10920 bytes
SHA-256: 18513d491a61a353c98f751c420b42fc5a0b82d0b04b4d18a10026497000fbd4
font_01_sfnt_off000107da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DA 17956 bytes
SHA-256: 016776e9d83377ab35ac1458061e5e89bf0757c6d11825d1ab5e202ac663a4af
font_02_sfnt_off000136d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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